@Park -- My advice would be to ask her to work on dissecting her feelings and getting more comfortable, with the goal of giving you the same freedom you've given her within a broad timeline (4 months?). Its not necessarily reasonable, fair, or possible to ask her to get over her fear/jealousy/insecurity right away, but my perspective is that she should be putting in the emotional work necessary for you and the gf to eventually have the alone time and one-on-one connection that is (imho) essential for a serious relationship. Step one is figuring out why she feels this way. It will probably require some deep digging and long conversations.